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<div class="header">
  <div class="headertitle"><div class="title">STM32H7xx_System_Exported_Functions <div class="ingroups"><a class="el" href="group___c_m_s_i_s.html">CMSIS</a> &raquo; <a class="el" href="group__stm32h7xx__system.html">Stm32h7xx_system</a></div></div></div>
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<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 id="header-func-members" class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga93f514700ccf00d08dbdcff7f1224eb2" id="r_ga93f514700ccf00d08dbdcff7f1224eb2"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ga93f514700ccf00d08dbdcff7f1224eb2">SystemInit</a> (void)</td></tr>
<tr class="memdesc:ga93f514700ccf00d08dbdcff7f1224eb2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Setup the microcontroller system Initialize the FPU setting and vector table location configuration.  <br /></td></tr>
<tr class="memitem:gae0c36a9591fe6e9c45ecb21a794f0f0f" id="r_gae0c36a9591fe6e9c45ecb21a794f0f0f"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#gae0c36a9591fe6e9c45ecb21a794f0f0f">SystemCoreClockUpdate</a> (void)</td></tr>
<tr class="memdesc:gae0c36a9591fe6e9c45ecb21a794f0f0f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Update SystemCoreClock variable according to Clock Register Values. The SystemCoreClock variable contains the core clock , it can be used by the user application to setup the SysTick timer or configure other parameters.  <br /></td></tr>
<tr class="memitem:gad150a6a4fd63fa73f4625b060691238a" id="r_gad150a6a4fd63fa73f4625b060691238a"><td class="memItemLeft" align="right" valign="top"><a id="gad150a6a4fd63fa73f4625b060691238a" name="gad150a6a4fd63fa73f4625b060691238a"></a>
void&#160;</td><td class="memItemRight" valign="bottom"><b>ExitRun0Mode</b> (void)</td></tr>
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<a name="details" id="details"></a><h2 id="header-details" class="groupheader">Detailed Description</h2>
<a name="doc-func-members" id="doc-func-members"></a><h2 id="header-doc-func-members" class="groupheader">Function Documentation</h2>
<a id="gae0c36a9591fe6e9c45ecb21a794f0f0f" name="gae0c36a9591fe6e9c45ecb21a794f0f0f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gae0c36a9591fe6e9c45ecb21a794f0f0f">&#9670;&#160;</a></span>SystemCoreClockUpdate()</h2>

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          <td class="memname">void SystemCoreClockUpdate </td>
          <td>(</td>
          <td class="paramtype">void</td>          <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
          <td></td>
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<span class="mlabels"><span class="mlabel extern">extern</span></span>  </td>
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<p>Update SystemCoreClock variable according to Clock Register Values. The SystemCoreClock variable contains the core clock , it can be used by the user application to setup the SysTick timer or configure other parameters. </p>
<dl class="section note"><dt>Note</dt><dd>Each time the core clock changes, this function must be called to update SystemCoreClock variable value. Otherwise, any configuration based on this variable will be incorrect.</dd>
<dd>
- The system frequency computed by this function is not the real frequency in the chip. It is calculated based on the predefined constant and the selected clock source:</dd></dl>
<ul>
<li>If SYSCLK source is CSI, SystemCoreClock will contain the <a class="el" href="group___s_t_m32_h7xx___system___private___includes.html#ga4dcbff36a4b1cfd045c01d59084255d0">CSI_VALUE(*)</a></li>
<li>If SYSCLK source is HSI, SystemCoreClock will contain the <a class="el" href="group___s_t_m32_h7xx___system___private___includes.html#gaaa8c76e274d0f6dd2cefb5d0b17fbc37">HSI_VALUE(**)</a></li>
<li>If SYSCLK source is HSE, SystemCoreClock will contain the <a class="el" href="group___s_t_m32_h7xx___system___private___includes.html#gaeafcff4f57440c60e64812dddd13e7cb">HSE_VALUE(***)</a></li>
<li>If SYSCLK source is PLL, SystemCoreClock will contain the <a class="el" href="group___s_t_m32_h7xx___system___private___includes.html#ga4dcbff36a4b1cfd045c01d59084255d0">CSI_VALUE(*)</a>, <a class="el" href="group___s_t_m32_h7xx___system___private___includes.html#gaaa8c76e274d0f6dd2cefb5d0b17fbc37">HSI_VALUE(**)</a> or <a class="el" href="group___s_t_m32_h7xx___system___private___includes.html#gaeafcff4f57440c60e64812dddd13e7cb">HSE_VALUE(***)</a> multiplied/divided by the PLL factors.</li>
</ul>
<p>(*) CSI_VALUE is a constant defined in <a class="el" href="stm32h7xx__hal_8h.html" title="This file contains all the functions prototypes for the HAL module driver.">stm32h7xx_hal.h</a> file (default value 4 MHz) but the real value may vary depending on the variations in voltage and temperature. (**) HSI_VALUE is a constant defined in <a class="el" href="stm32h7xx__hal_8h.html" title="This file contains all the functions prototypes for the HAL module driver.">stm32h7xx_hal.h</a> file (default value 64 MHz) but the real value may vary depending on the variations in voltage and temperature.</p>
<p>(***)HSE_VALUE is a constant defined in <a class="el" href="stm32h7xx__hal_8h.html" title="This file contains all the functions prototypes for the HAL module driver.">stm32h7xx_hal.h</a> file (default value 25 MHz), user has to ensure that HSE_VALUE is same as the real frequency of the crystal used. Otherwise, this function may have wrong result.</p>
<ul>
<li>The result of this function could be not correct when using fractional value for HSE crystal. <dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">None</td><td></td></tr>
  </table>
  </dd>
</dl>
<dl class="retval"><dt>Return values</dt><dd>
  <table class="retval">
    <tr><td class="paramname">None</td><td></td></tr>
  </table>
  </dd>
</dl>
</li>
</ul>

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<a id="ga93f514700ccf00d08dbdcff7f1224eb2" name="ga93f514700ccf00d08dbdcff7f1224eb2"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga93f514700ccf00d08dbdcff7f1224eb2">&#9670;&#160;</a></span>SystemInit()</h2>

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          <td class="memname">void SystemInit </td>
          <td>(</td>
          <td class="paramtype">void</td>          <td class="paramname"><span class="paramname"><em></em></span></td><td>)</td>
          <td></td>
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<span class="mlabels"><span class="mlabel extern">extern</span></span>  </td>
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<p>Setup the microcontroller system Initialize the FPU setting and vector table location configuration. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">None</td><td></td></tr>
  </table>
  </dd>
</dl>
<dl class="retval"><dt>Return values</dt><dd>
  <table class="retval">
    <tr><td class="paramname">None</td><td></td></tr>
  </table>
  </dd>
</dl>

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